# RT7270HZSP

**Richtek Tech** · DC-DC Converters · SOP-8-EP

RT7270HZSP from Richtek Tech, in a SOP-8-EP. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | BOOT | passive | Bootstrap for high side gate driver; connect a 0.1μF or greater ceramic capacitor from BOOT to SW. |
| 2 | VIN | power_in | Input supply voltage, 4.5V to 18V; must be bypassed with a suitable large ceramic capacitor. |
| 3 | SW | power_out | Switch node; connect to an external L-C filter. |
| 4 | GND | power_in | Ground; the exposed pad (pin 9) must be soldered to a large PCB and connected to GND for maximum power dissipation. |
| 5 | FB | input | Feedback input used to regulate the output to a set value via an external resistive voltage divider (0.925V reference typ.). |
| 6 | COMP | passive | Compensation node for the regulation control loop; connect a series RC network from COMP to GND, sometimes with an additional capacitor. |
| 7 | EN | input | Enable input; logic high enables the converter, logic low (<0.4V) forces shutdown with supply current below 3μA. |
| 8 | SS | passive | Soft-start control input; a capacitor from SS to GND sets the soft-start period (0.1μF gives 15.5ms). |
| 9 | GND | power_in | Exposed pad, ground; must be soldered to a large PCB and connected to GND for maximum power dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | SOP-8-EP |
| Category | Power Management ICs |
| Pins | 9 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Shutdown Supply Current |  |  | 0.5 | 3 | μA | VEN = 0V | 4 |
| Supply Current |  |  | 0.8 | 1.2 | mA | VEN = 3V, VFB = 0.9V | 4 |
| Reference Voltage | VREF | 0.911 | 0.925 | 0.939 | V | 4.5V ≤ VIN ≤ 18V | 4 |
| High Side Switch Leakage Current |  |  | 0 | 10 | μA | VEN = 0V, VSW = 0V | 4 |
| Oscillation Frequency | fOSC1 | 300 | 340 | 380 | kHz |  | 4 |
| EN Input Threshold Logic-High | VIH | 2.7 |  | 18 | V |  | 5 |
| EN Input Threshold Logic-Low | VIL |  |  | 0.4 | V |  | 5 |
| Input Under Voltage Lockout Threshold | VUVLO | 3.8 | 4.2 | 4.5 | V | VIN Rising | 5 |
| Supply Input Voltage | VIN | -0.3 |  | 20 | V |  | 4 |
| Switch Voltage | SW | -0.3 |  |  | V | upper limit VIN + 0.3V | 4 |
| VBOOT − VSW |  | -0.3 |  | 6 | V |  | 4 |
| Other Pins Voltage |  | -0.3 |  | 20 | V |  | 4 |
| Power Dissipation | PD |  |  | 1.333 | W | TA = 25°C, SOP-8 (Exposed Pad) | 4 |
| Lead Temperature |  |  |  | 260 | °C | Soldering, 10 sec. | 4 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 4 |
| Storage Temperature Range |  | -65 |  | 150 | °C |  | 4 |
| ESD HBM |  |  |  | 2 | kV | Human Body Mode | 4 |
| ESD MM |  |  |  | 200 | V | Machine Mode | 4 |
| Supply Input Voltage | VIN | 4.5 |  | 18 | V |  | 4 |
| Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 4 |
| Ambient Temperature Range | TA | -40 |  | 85 | °C |  | 4 |
| Thermal Resistance Junction to Ambient | θJA |  |  | 75 | °C/W | SOP-8 (Exposed Pad) | 4 |
| Thermal Resistance Junction to Case | θJC |  |  | 15 | °C/W | SOP-8 (Exposed Pad) | 4 |
| Error Amplifier Transconductance | GEA |  | 940 |  | μA/V | ΔIC = ±10μA | 4 |
| High Side Switch On-Resistance | RDS(ON)1 |  | 110 |  | mΩ |  | 4 |
| Low Side Switch On-Resistance | RDS(ON)2 |  | 90 |  | mΩ |  | 4 |
| Upper Switch Current Limit |  |  | 5.1 |  | A | Min. Duty Cycle, VBOOT − VSW = 4.8V | 4 |
| COMP to Current Sense Transconductance | GCS |  | 5.1 |  | A/V |  | 4 |
| Short Circuit Oscillation Frequency | fOSC2 |  | 100 |  | kHz | VFB = 0V | 4 |
| Maximum Duty Cycle | DMAX |  | 93 |  | % | VFB = 0.7V | 5 |
| Minimum On Time | tON |  | 100 |  | ns |  | 5 |
| Input Under Voltage Lockout Hysteresis | ΔVUVLO |  | 320 |  | mV |  | 5 |
| Soft-Start Current | ISS |  | 6 |  | μA | VSS = 0V | 5 |
| Soft-Start Period | tSS |  | 15.5 |  | ms | CSS = 0.1μF | 5 |
| Thermal Shutdown | TSD |  | 150 |  | °C |  | 5 |

## CAD (KiCad official)

- Symbol: `RT7270HZSP`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: SOP-8-EP (KiCad packages3D, STEP)

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Richtek Tech datasheet](docs/rt7270hzsp-datasheet.pdf) (14 pp, sha256 `7a053d354c72b905`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/rt7270hzsp-datasheet.pdf)